Effect of Gold on Nickel Catalyst for Carbon Dioxide Reforming of Methane Reaction

• Main Authors: Wen-Ling Lo, 羅文伶
• Other Authors: Hsiu-Wei Chen
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/16239817574952734578

碩士 === 國立中山大學 === 化學系研究所 === 103 === The effect of gold to silica-supported nickel catalysts modified by additives such as Potassium and Zirconium(IV) oxide for Carbon dioxide reforming of methane (DRM) had been studied. These catalysts were characterized using X-ray Diffraction Spectrum (XRD), Scanning Electron Microscopy (SEM) and Thermal Gravimetric Analysis (TGA). The results indicated that the addition of gold to Ni/SiO2 prevented nickel from the agglomerate after 24h reaction, and SEM showed that the formation of metal particles on the tips of the carbon nanofibers led to avoid carbon depositing on the metal particles surface. The results showed that modified gold-nickel bimetal catalysts by an alkali caused an increasing of the activity of CO2 and the selectivity of CO, while addition of acidic Zr would decrease catalytic activity. Addition of alkaline promoter, K, to NiAu/SiO2 induced electronic enrichment of the active phase promoted the activating of CO2 and inhibited the carbon formation on metal surface. On the other hand, the addition of an acidic additive, Zr, to NiAu/SiO2 catalysts was unfavorable for carbon dioxide reforming of methane. Both addition of gold or additives changed the energy activation accounted for a different reactivity of Ni particles towards reactants/ or reaction intermediates.